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Date: Tue, 31 Mar 2009 13:39:52 -0700
From: Stephen Hemminger <shemminger@...tta.com>
To: Gregory Haskins <ghaskins@...ell.com>
Cc: linux-kernel@...r.kernel.org, agraf@...e.de, pmullaney@...ell.com,
pmorreale@...ell.com, anthony@...emonkey.ws, rusty@...tcorp.com.au,
netdev@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [RFC PATCH 09/17] net: Add vbus_enet driver
On Tue, 31 Mar 2009 14:43:34 -0400
Gregory Haskins <ghaskins@...ell.com> wrote:
> Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
> ---
>
> drivers/net/Kconfig | 13 +
> drivers/net/Makefile | 1
> drivers/net/vbus-enet.c | 706 +++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 720 insertions(+), 0 deletions(-)
> create mode 100644 drivers/net/vbus-enet.c
>
> diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
> index 62d732a..ac9dabd 100644
> --- a/drivers/net/Kconfig
> +++ b/drivers/net/Kconfig
> @@ -3099,4 +3099,17 @@ config VIRTIO_NET
> This is the virtual network driver for virtio. It can be used with
> lguest or QEMU based VMMs (like KVM or Xen). Say Y or M.
>
> +config VBUS_ENET
> + tristate "Virtual Ethernet Driver"
> + depends on VBUS_DRIVERS
> + help
> + A virtualized 802.x network device based on the VBUS interface.
> + It can be used with any hypervisor/kernel that supports the
> + vbus protocol.
> +
> +config VBUS_ENET_DEBUG
> + bool "Enable Debugging"
> + depends on VBUS_ENET
> + default n
> +
> endif # NETDEVICES
> diff --git a/drivers/net/Makefile b/drivers/net/Makefile
> index 471baaf..61db928 100644
> --- a/drivers/net/Makefile
> +++ b/drivers/net/Makefile
> @@ -264,6 +264,7 @@ obj-$(CONFIG_FS_ENET) += fs_enet/
> obj-$(CONFIG_NETXEN_NIC) += netxen/
> obj-$(CONFIG_NIU) += niu.o
> obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
> +obj-$(CONFIG_VBUS_ENET) += vbus-enet.o
> obj-$(CONFIG_SFC) += sfc/
>
> obj-$(CONFIG_WIMAX) += wimax/
> diff --git a/drivers/net/vbus-enet.c b/drivers/net/vbus-enet.c
> new file mode 100644
> index 0000000..e698b3f
> --- /dev/null
> +++ b/drivers/net/vbus-enet.c
> @@ -0,0 +1,706 @@
> +/*
> + * vbus_enet - A virtualized 802.x network device based on the VBUS interface
> + *
> + * Copyright (C) 2009 Novell, Gregory Haskins <ghaskins@...ell.com>
> + *
> + * Derived from the SNULL example from the book "Linux Device Drivers" by
> + * Alessandro Rubini, Jonathan Corbet, and Greg Kroah-Hartman, published
> + * by O'Reilly & Associates.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/moduleparam.h>
> +
> +#include <linux/sched.h>
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/errno.h>
> +#include <linux/types.h>
> +#include <linux/interrupt.h>
> +
> +#include <linux/in.h>
> +#include <linux/netdevice.h>
> +#include <linux/etherdevice.h>
> +#include <linux/ip.h>
> +#include <linux/tcp.h>
> +#include <linux/skbuff.h>
> +#include <linux/ioq.h>
> +#include <linux/vbus_driver.h>
> +
> +#include <linux/in6.h>
> +#include <asm/checksum.h>
> +
> +#include <linux/venet.h>
> +
> +MODULE_AUTHOR("Gregory Haskins");
> +MODULE_LICENSE("GPL");
> +
> +static int napi_weight = 128;
> +module_param(napi_weight, int, 0444);
> +static int rx_ringlen = 256;
> +module_param(rx_ringlen, int, 0444);
> +static int tx_ringlen = 256;
> +module_param(tx_ringlen, int, 0444);
> +
> +#undef PDEBUG /* undef it, just in case */
> +#ifdef VBUS_ENET_DEBUG
> +# define PDEBUG(fmt, args...) printk(KERN_DEBUG "vbus_enet: " fmt, ## args)
> +#else
> +# define PDEBUG(fmt, args...) /* not debugging: nothing */
> +#endif
> +
> +struct vbus_enet_queue {
> + struct ioq *queue;
> + struct ioq_notifier notifier;
> +};
> +
> +struct vbus_enet_priv {
> + spinlock_t lock;
> + struct net_device *dev;
> + struct vbus_device_proxy *vdev;
> + struct napi_struct napi;
> + struct net_device_stats stats;
Not needed any more, stats are available in net_device
> + struct vbus_enet_queue rxq;
> + struct vbus_enet_queue txq;
> + struct tasklet_struct txtask;
> +};
> +
> + * Ioctl commands
> + */
> +static int
> +vbus_enet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
> +{
> + PDEBUG("ioctl\n");
> + return 0;
> +}
If it doesn't do ioctl, just leave pointer as NULL
> +/*
> + * Return statistics to the caller
> + */
> +static struct net_device_stats *
> +vbus_enet_stats(struct net_device *dev)
> +{
> + struct vbus_enet_priv *priv = netdev_priv(dev);
> + return &priv->stats;
> +}
Not needed if you use internal net_device stats
> +static void
> +rx_isr(struct ioq_notifier *notifier)
> +{
> + struct vbus_enet_priv *priv;
> + struct net_device *dev;
> +
> + priv = container_of(notifier, struct vbus_enet_priv, rxq.notifier);
> + dev = priv->dev;
> +
> + if (!ioq_empty(priv->rxq.queue, ioq_idxtype_inuse))
> + vbus_enet_schedule_rx(priv);
> +}
> +
> +static void
> +deferred_tx_isr(unsigned long data)
> +{
> + struct vbus_enet_priv *priv = (struct vbus_enet_priv *)data;
> + unsigned long flags;
> +
> + PDEBUG("deferred_tx_isr for %lld\n", priv->vdev->id);
> +
> + spin_lock_irqsave(&priv->lock, flags);
> + vbus_enet_tx_reap(priv, 0);
> + spin_unlock_irqrestore(&priv->lock, flags);
> +
> + ioq_notify_enable(priv->txq.queue, 0);
> +}
> +
> +static void
> +tx_isr(struct ioq_notifier *notifier)
> +{
> + struct vbus_enet_priv *priv;
> + unsigned long flags;
> +
> + priv = container_of(notifier, struct vbus_enet_priv, txq.notifier);
> +
> + PDEBUG("tx_isr for %lld\n", priv->vdev->id);
> +
> + ioq_notify_disable(priv->txq.queue, 0);
> + tasklet_schedule(&priv->txtask);
> +}
> +
> +static struct net_device_ops vbus_enet_netdev_ops = {
Should be const.
> + .ndo_open = vbus_enet_open,
> + .ndo_stop = vbus_enet_stop,
> + .ndo_set_config = vbus_enet_config,
> + .ndo_start_xmit = vbus_enet_tx_start,
> + .ndo_change_mtu = vbus_enet_change_mtu,
> + .ndo_do_ioctl = vbus_enet_ioctl,
> + .ndo_get_stats = vbus_enet_stats,
> + .ndo_tx_timeout = vbus_enet_timeout,
> +};
> +
> +/*
> + * This is called whenever a new vbus_device_proxy is added to the vbus
> + * with the matching VENET_ID
> + */
> +static int
> +vbus_enet_probe(struct vbus_device_proxy *vdev)
> +{
> + struct net_device *dev;
> + struct vbus_enet_priv *priv;
> + int ret;
> +
> + printk(KERN_INFO "VBUS_ENET: Found new device at %lld\n", vdev->id);
> +
> + ret = vdev->ops->open(vdev, VENET_VERSION, 0);
> + if (ret < 0)
> + return ret;
> +
> + dev = alloc_etherdev(sizeof(struct vbus_enet_priv));
> + if (!dev)
> + return -ENOMEM;
> +
> + priv = netdev_priv(dev);
> + memset(priv, 0, sizeof(*priv));
Useless already done by alloc_etherdev
> +
> + spin_lock_init(&priv->lock);
> + priv->dev = dev;
> + priv->vdev = vdev;
> +
> + tasklet_init(&priv->txtask, deferred_tx_isr, (unsigned long)priv);
> +
> + queue_init(priv, &priv->rxq, VENET_QUEUE_RX, rx_ringlen, rx_isr);
> + queue_init(priv, &priv->txq, VENET_QUEUE_TX, tx_ringlen, tx_isr);
> +
> + rx_setup(priv);
> +
> + ioq_notify_enable(priv->rxq.queue, 0); /* enable interrupts */
> + ioq_notify_enable(priv->txq.queue, 0);
> +
> + ether_setup(dev); /* assign some of the fields */
Useless already done by alloc_etherdiv
> +
> + dev->netdev_ops = &vbus_enet_netdev_ops;
> + dev->watchdog_timeo = 5 * HZ;
> +
Please consider adding basic set of ethtool_ops to allow controlling
offload, etc.
--
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